EP1402137A1 - Pole-top insulator - Google Patents
Pole-top insulatorInfo
- Publication number
- EP1402137A1 EP1402137A1 EP02736382A EP02736382A EP1402137A1 EP 1402137 A1 EP1402137 A1 EP 1402137A1 EP 02736382 A EP02736382 A EP 02736382A EP 02736382 A EP02736382 A EP 02736382A EP 1402137 A1 EP1402137 A1 EP 1402137A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pole
- top insulator
- supporting arms
- tubular
- insulator according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/05—Suspension arrangements or devices for electric cables or lines
- H02G7/053—Suspension clamps and clips for electric overhead lines not suspended to a supporting wire
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/20—Spatial arrangements or dispositions of lines or cables on poles, posts or towers
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
- E04H12/24—Cross arms
Definitions
- the present invention concerns a pole-top insulator for carrying overhead electrical cables on pole legs or similar supports located along power lines and that includes one or more self- supporting tubular parts made of electrically insulating composite material to which supporting cables are fixed on the top end of the said supports.
- the means of carrying cables in high-tension power lines is usually achieved with the use of pylons in the form of steel f amework structures, the legs and upper horizontal crossbar of which form the structural components.
- the insulators are supported by the crossbar in an essentially freely suspended manner, whereby the lines or phase leads are attached to the bottom of the inuslators.
- the said insulators are only used for insulation and to separate the cables from each other and the pole structure, however.
- pole-top insulators can be made using different types of fibreglass designs or so-called composites.
- This known, self- supporting, insulating arrangement has thus far been used exclusively for low-voltage lines due to the problem of achieving the necessary strength to withstand the forces that arise in high-voltage power lines.
- it has proved to be difficult to overcome the strength problems that arise between the attachment points of the composite material or their transitional parts.
- the object of the present invention is therefore to produce an improved pole-top insulator and in this part a pole-top insulator that is not impaired with the aforesaid disadvantages,
- a pole-top insulator that is insulating and self-supporting, aesthetically attractive and possible to prefabricate to a high degree and in principle can be fitted to an existing pole leg as a complete unit is to be aimed at.
- An additional object of the invention is to produce a pole-top insulator that considerably reduces the transverse span of the power line, i.e. its width, and which can be mounted on a pole leg or similar supporting structure as one prefabricated, compact, continuous unit.
- Another object of the invention is to produce a power line carrier with a more compact design to form so-called compact lines, whereby the electromagnetic field surrounding the power line can be reduced and the aesthetic impression of the power line can be enhanced. It is further desirable to reduce the size of the carrier unit.
- pole-top insulator exhibiting the distinctive features and characteristics specified in claim 1. Further distinctive features and advantages of the invention are given in the dependent claims.
- both the centre part 3 and the tubular supporting arms are one continuous unit made of a composite material.
- the centre part 3 described in the embodiment below, from which the tubular supporting arms of composite material 1, 2, 2' extend, comprises in principle two separate parts. These are the centre part 3 itself and the support piece 16 joined to it. It should be understood, however, that the said parts could nevertheless be made in one piece or as one unit that would form the centre part 3.
- FIGURE DESCRIF ⁇ ON
- fig. 1 shows a perspective view of a pole-top insulator according to the invention mounted on the free end of a pole leg
- fig. 2 shows a side view of a centre part in the pole-top insulator
- fig. 3 shows a side view in partial cross-section of the mounting between a tubular part of a composite material in the pole-top insulator and the centre part.
- fig. 4 shows a side view of a support part that is in the centre part and can be attached to it
- fig. 5 shows a side view in partial cross-section of a flange located on the free end of the tubular part.
- the present pole-top insulator in the embodiment shown in the drawings includes a first vertical tubular support arm 1 and a second and third designated 2 and 2' respectively similar tubular supporting arms that are oriented horizontally and located symmetrically on each side of a vertical plane of symmetry A and through the vertical tubular part.
- Each tubular and relatively continuous supporting arm 1, 2 and 2' are made of some electrically insulating composite material, which can be made up of fibreglass reinforced epoxy. Suitable methods of manufacture include wet filament winding or injection moulding.
- the said tubular supporting arm can be monolithic or comprise several inter-joining tubular parts with a common centre axis,
- the tubular supporting arm then made is so designed that it exhibits both good insulating properties as well as such a high strength that it can be used as a self- supporting element with one or more phase leads or lines supported on its free end.
- the tubular supporting arm besides being cylindrical, can have an essentially conical shape leading up to its free end.
- the tubular supporting arm can include several different layers of long fibres running in alternate directions and can suitably be made of fibreglass or Kevlar fibre embedded in epoxy resin.
- the tubular supporting arms can suitably be made by winding fibreglass threads around a mandrel while applying epoxy resin. After curing the composite material, the finished tubular supporting arm can be removed.
- the tubular supporting arms 1, 2, 2' are inter-joined via a centre part 3 in such a way that the finished unit can be applied to the free end of a pole leg or similar support structure 4.
- the finished unit of supporting arms exhibits hereby an essentially triangular pattern viewed along the length of the lines or the supporting arms 1, 2, 2' in principle the shape of an upside down T, whereby the supporting arms can extend freely out from the centre part 3.
- the said triangular form has been shown to reduce the magnetic radiation field by up to 50% compared to conventional supports where the leads are supported a distance from each other on horizontal crossbars.
- the tubular support arms 1 and 2, 2' are on their respective free ends fitted with retainers 5 comprising one or more C-shaped clips 7 arranged on arms 6 to which a phase line 8 is attached.
- the phase leads 8 arranged a distance from each other and supported by the pole-top insulator comprise the three respective phases of the conveyed alternating current and that each of the said tubular parts 1 and 2, 2' support one or more conductors for each such phase.
- a top lead (not shown) is mounted at the top of the vertical support arm 1.
- Overvoltage protection in the form of a valve-type surge arrester 9 is connected electrically between the top lead and the centre part 3 and therefore joined to the said parts at 10 and 11 respectively.
- the top end 9 of the valve-type surge arrester 8 is connected to the top lead via an electrically conductive rod or arm 12 extending from the top free end of the supporting arm 1.
- the valve-type surge arrester 8 form one preassembled unit integrated with the pole-top insulator.
- the top lead is electrically connected to earth via the arm 12, valve-type surge arrester 9 and the centre part 3, whereby the connection to earth is made when the centre part 3 is applied to the support structure 4.
- the centre part 3 includes in principle a mainly cylindrical housing, the circular discoid sides 13 and 14 of which extend radially to form a flange-like mounting surface at their outer edges.
- the housing and the other parts described below are manufactured in an electrically conductive material, suitably aluminium.
- the housing is joined with a complementarity designed discoid flange to a support 16 arranged on the end of the vertical support arm 1 and to a discoid flange 17 on the upper end of the support structure 4.
- the load bearing parts of an electric pylon are in some cases exerted to extremely high loads and bending stresses.
- the use of composite materials also involves certain problems regarding the present design of the pole-top insulator and in particular concerning the attachment points between the tubular supporting arms 1, 2, 2' and the centre part 3,
- the joint between the said tubular parts 1, 2, 2' and the centre part 3 is designed in such a way that the supporting arms are supported along a considerable part of its outer edge when attached to the centre part.
- the centre part 3 is described in more detail below and since its design is identical on each side of the plane of symmetry A, only one side will be described in detail with reference to fig. 3, As is evident herewith, the centre part 3 has an opening 18 extending radially inwards perpendicular to the main axis of the vertical tubular supporting arm 1 defined by the inner space of a cylindrical support tube 19 extending diametrically through the centre part.
- One end of the horizontal supporting arm 2' is fitted into the said opening 18 and secured to the wall of the supporting tube 19 using a means of locking between the said parts, which herewith comprises interacting threads 20, 21.
- the outside thread 21 is made on the immediate end of the horizontal supporting arm 2'.
- a large supporting contact surface is achieved by the end of the horizontal supporting arm 2 1 extending far into the supporting tube 19.
- Fig. 4 shows the vertical supporting arm 1 mounting in detail.
- the support 16 includes a cylindrical supporting tube 22, into the opening 23 of which a considerable part of one end of the vertical supporting arm 1 is inserted.
- the supporting tube 22 is joined perpendicularly to the main plain of a circular discoid flange 25, the outside diameter of which corresponds with the outside diameter of the side 13 of the centre part 3.
- the flange 25 has a hole arranged in its centre, against the wall 26 of which the bottom end of the supporting tube is fitted and fixed so that the supporting tube 22 and the discoid flange 25 exhibit concentric main axes.
- the discoid flange 25, and thereby the support 16, is j oined to the top discoid side 13 of the centre part 3 by a means of union 15.
- the vertical supporting arm 1 is fixed to the inside wall of the supporting tube 22 by a means of locking comprising interacting threads 28, 29.
- a long insert length in the supporting tube 22 contributes to a low contact pressure between the said parts.
- the outside thread 29 is made on the immediate end of the vertical supporting arm 1.
- wedge-shaped bracing elements 30 evenly distributed around the outside edge of the supporting tube 22 and extending between the outside edge of the supporting tube and the main side of the discoid flange 25.
- the tubular supporting arms 1, 2, 2' have an outer insulation of wave or groove profile silicone 31 on their outer edges extending along each supporting arm between a ring 32 of conductive material, located on the end of the supporting arm that is fitted into the centre part 3 and the support 16 respectively, and a circular flange 33 arranged on the other free end of the supporting arm.
- the said flange 33 is so designed that it surrounds and essentially seals the free end of each supporting arm 1, 2, 2'. Therefore, the flange 33 includes a bottom part 34 facing the end of the supporting arm and a ring-shaped side wall 35 extending radially from the bottom part to surround a length of the outside edge of the supporting arm.
- Both the ring 32 and the flange 33 exhibit a length of reduced diamet ⁇ T 36 and 37 respectively, which forms the defined connection and contact points for the silicone layer 31 and allows a smooth and pliant transition between the said parts.
- the flange 33 is fixed to the said supporting arms 1 and 2, 2' respectively via a means of locking comprising interacting threads 38, 39.
- the bottom part 34 is furthermore fitted with a means of fastening in the form of threaded holes 40 that make it possible to easily screw on the retainers 5 to the free ends of the supporting arms for attaching the leads.
- a foam material 41 To prevent damp entering and thereby causing current leakage in the interior cavities of the tubular supporting arms 1, 2, 2' they are filled with a foam material 41.
Landscapes
- Insulators (AREA)
- Suspension Of Electric Lines Or Cables (AREA)
- Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
- Materials For Medical Uses (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE0102153A SE0102153D0 (en) | 2001-06-14 | 2001-06-14 | Chair head for overhead line |
SE0102153 | 2001-06-14 | ||
PCT/SE2002/001054 WO2003014496A1 (en) | 2001-06-14 | 2002-06-03 | Pole-top insulator |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1402137A1 true EP1402137A1 (en) | 2004-03-31 |
EP1402137B1 EP1402137B1 (en) | 2009-09-16 |
Family
ID=20284514
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02736382A Expired - Lifetime EP1402137B1 (en) | 2001-06-14 | 2002-06-03 | Pole-top insulator |
Country Status (7)
Country | Link |
---|---|
US (1) | US6965074B2 (en) |
EP (1) | EP1402137B1 (en) |
CN (1) | CN1309925C (en) |
AT (1) | ATE443192T1 (en) |
DE (1) | DE60233730D1 (en) |
SE (1) | SE0102153D0 (en) |
WO (1) | WO2003014496A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113062652A (en) * | 2021-03-05 | 2021-07-02 | 许继集团有限公司 | Pole-mounted transformer cross arm mounting and dismounting mechanism and using method |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7578488B2 (en) * | 2005-02-01 | 2009-08-25 | The Southern Company | Temporary arm gain and saddle |
EP1801819B1 (en) | 2005-12-23 | 2012-05-23 | ABB Technology Ltd | A method for manufacturing a post insulator and a post insulator |
WO2009049376A1 (en) * | 2007-10-19 | 2009-04-23 | Farallon Capital Pty Ltd | Power line supporting apparatus |
CN101202431B (en) * | 2007-12-07 | 2010-06-02 | 中国电力科学研究院 | Insulation tower head for power distribution network overhead line |
EP2748224B1 (en) * | 2011-09-09 | 2017-07-05 | ABB Research Ltd. | Method of producing high voltage electrical insulation |
WO2022033690A1 (en) * | 2020-08-13 | 2022-02-17 | Siemens Energy Global GmbH & Co. KG | Support structure for an electrical conductor |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1175078A (en) * | 1914-05-04 | 1916-03-14 | Charles L Peirce Jr | Insulator-supporting fixture. |
US1546213A (en) * | 1923-12-20 | 1925-07-14 | Duffy Ralph Early | Insulator support |
US2056366A (en) * | 1934-01-20 | 1936-10-06 | Smithjohns Inc | Pole-top fixture |
US3032606A (en) * | 1960-11-22 | 1962-05-01 | Mc Graw Edison Co | Aerial cable bracket |
US3267202A (en) * | 1963-01-16 | 1966-08-16 | Performance Insulator Inc | Adjustable insulator support |
US3187175A (en) * | 1963-03-21 | 1965-06-01 | Mc Graw Edison Co | Power distribution system |
US3360686A (en) * | 1966-08-05 | 1967-12-26 | Ohio Brass Co | Lightning protection assembly for overhead lines |
US3445582A (en) * | 1966-09-29 | 1969-05-20 | Pacific Gas & Electric Co | Pole top mounting bracket for electrical transmission line |
US3649740A (en) * | 1967-11-09 | 1972-03-14 | John R Boyer | Pole-top structure for electric distribution lines |
US3637918A (en) * | 1970-03-20 | 1972-01-25 | Detroit Edison Co | Fuse and arrester insert bracket |
US4025824A (en) * | 1976-02-12 | 1977-05-24 | Cheatham Harry P | Transformer support rack |
CN2168914Y (en) * | 1993-10-13 | 1994-06-15 | 成都市玻璃钢制品厂 | Insulated glass fibre reinforced plastic crossbar |
CA2134617C (en) * | 1994-10-28 | 1998-01-06 | Daniel Neil O'connell | Boom-mountable robotic arm |
US5772158A (en) * | 1996-12-02 | 1998-06-30 | Blanding; Douglas | Apparatus for laterally offsetting power lines from utility poles |
US5981879A (en) * | 1997-10-17 | 1999-11-09 | New Line Products, Llc | Insulating support device for electrical conductor |
US6229086B1 (en) * | 1999-03-12 | 2001-05-08 | Douglas Blanding | Adapter for mounting multiple circuits to utility poles with a pair of cross-arms using candlestick holders |
-
2001
- 2001-06-14 SE SE0102153A patent/SE0102153D0/en unknown
-
2002
- 2002-06-03 CN CNB028119258A patent/CN1309925C/en not_active Expired - Lifetime
- 2002-06-03 US US10/480,834 patent/US6965074B2/en not_active Expired - Lifetime
- 2002-06-03 DE DE60233730T patent/DE60233730D1/en not_active Expired - Lifetime
- 2002-06-03 WO PCT/SE2002/001054 patent/WO2003014496A1/en not_active Application Discontinuation
- 2002-06-03 EP EP02736382A patent/EP1402137B1/en not_active Expired - Lifetime
- 2002-06-03 AT AT02736382T patent/ATE443192T1/en not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO03014496A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113062652A (en) * | 2021-03-05 | 2021-07-02 | 许继集团有限公司 | Pole-mounted transformer cross arm mounting and dismounting mechanism and using method |
Also Published As
Publication number | Publication date |
---|---|
WO2003014496A1 (en) | 2003-02-20 |
SE0102153D0 (en) | 2001-06-14 |
CN1531619A (en) | 2004-09-22 |
US6965074B2 (en) | 2005-11-15 |
ATE443192T1 (en) | 2009-10-15 |
CN1309925C (en) | 2007-04-11 |
EP1402137B1 (en) | 2009-09-16 |
US20040251385A1 (en) | 2004-12-16 |
DE60233730D1 (en) | 2009-10-29 |
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